Optimal Motor Power for DIY Cat Waste and Litter Device

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Discussion Overview

The discussion centers around selecting an appropriate motor for a DIY cat waste and litter device, focusing on power requirements, motor types, and design considerations. Participants explore the implications of using AC versus DC motors, gearing options, and the overall design of the device.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant inquires about the necessary power of the motor for the device, suggesting a preference for AC motors due to perceived power advantages.
  • Another participant recommends a DC motor, noting that it is easier to control with digital electronics and suggests that the motor's power should be less than 30W, which is the power supply limit.
  • A participant asks for examples of suitable DC motors and questions whether to use one or two motors, proposing a gear rack/track system for turning the barrel.
  • It is suggested that turning from the outside edge is beneficial, potentially allowing for the use of a rubber driving wheel to simplify the design.
  • One participant mentions that a single motor simplifies the design and advises calculating the required rotation speed and acceleration before finalizing motor choices.
  • Another participant adds that sizing the drive motor to allow for friction drive slip could optimize performance, indicating that a more powerful motor might be unnecessary while a less powerful one could be inadequate.

Areas of Agreement / Disagreement

Participants express differing views on the type of motor to use (AC vs. DC) and the number of motors needed (one vs. two). There is no consensus on the optimal motor specifications or design approach, indicating an ongoing debate.

Contextual Notes

Participants have not provided specific calculations for rotation speed or acceleration, and there are unresolved considerations regarding the weight of the device and the effectiveness of different motor configurations.

SuperSneaky666
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I am a beginner in Electronics and motors, and I want to build a DIY device that is like this



I am just wondering how powerful is that motor that turns the globe in the device, which would hold the cat waste and litter. I am looking to get a powerful enough motor from Amazon.ca but just not sure how powerful do I need to go. I think I am looking for AC motors as they are more powerful than DC.

Does anyone know?
 
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The power supply is 30W so the motor must be smaller than that. I would suggest using a DC motor as they are much easier to control with digital electronics at this size.

You will need gearing to increase the torque to a sufficient value to turn the barrel of litter.

BoB
 
Ah ok, is it possible you could show me some example DC motors that would be powerful enough for this. And do you think it would be better to have just 1 motor on the side or 2 motors, 1 on each side? I was thinking of making a gear rack/track strip going around the barrel, and then attaching a gear to the motors to help turn.
 
Yes. Turning from the outside edge is a good idea. Depending on the weight you may be able to use a rubber driving wheel (think rock tumbler) then you won't have to make a large gear the correct size. You may be able to find a gearbox with attached rubber wheel ready made that will work for you. Using a large belt around the barrel like clothes dryers do might also be an option.

One motor simplifies the design. I would only look into multiple motors as a last resort.

First you need to calculate the rotation speed and acceleration you need. The only information we have now is that it can be done with less than 30W.

BoB
 
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rbelli1 said:
Turning from the outside edge is a good idea.
Especially because that would act as a safety clutch too.
 
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Rive said:
Especially because that would act as a safety clutch too.

You can then size the drive motor to be just powerful enough to make the friction drive slip. A more powerful motor would be wasted, a less powerful motor might not be enough.
 

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